CVE-2021-21295

Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty (io.netty:netty-codec-http2) before version 4.1.60.Final there is a vulnerability that enables request smuggling. If a Content-Length header is present in the original HTTP/2 request, the field is not validated by `Http2MultiplexHandler` as it is propagated up. This is fine as long as the request is not proxied through as HTTP/1.1. If the request comes in as an HTTP/2 stream, gets converted into the HTTP/1.1 domain objects (`HttpRequest`, `HttpContent`, etc.) via `Http2StreamFrameToHttpObjectCodec `and then sent up to the child channel's pipeline and proxied through a remote peer as HTTP/1.1 this may result in request smuggling. In a proxy case, users may assume the content-length is validated somehow, which is not the case. If the request is forwarded to a backend channel that is a HTTP/1.1 connection, the Content-Length now has meaning and needs to be checked. An attacker can smuggle requests inside the body as it gets downgraded from HTTP/2 to HTTP/1.1. For an example attack refer to the linked GitHub Advisory. Users are only affected if all of this is true: `HTTP2MultiplexCodec` or `Http2FrameCodec` is used, `Http2StreamFrameToHttpObjectCodec` is used to convert to HTTP/1.1 objects, and these HTTP/1.1 objects are forwarded to another remote peer. This has been patched in 4.1.60.Final As a workaround, the user can do the validation by themselves by implementing a custom `ChannelInboundHandler` that is put in the `ChannelPipeline` behind `Http2StreamFrameToHttpObjectCodec`.
References
Link Resource
https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj Third Party Advisory
https://github.com/Netflix/zuul/pull/980 Patch Third Party Advisory
https://github.com/netty/netty/commit/89c241e3b1795ff257af4ad6eadc616cb2fb3dc4 Patch Vendor Advisory
https://lists.apache.org/thread.html/r02e467123d45006a1dda20a38349e9c74c3a4b53e2e07be0939ecb3f@%3Cdev.ranger.apache.org%3E Mailing List Third Party Advisory
https://lists.apache.org/thread.html/r7bb3cdc192e9a6f863d3ea05422f09fa1ae2b88d4663e63696ee7ef5@%3Cdev.ranger.apache.org%3E Mailing List Third Party Advisory
https://lists.apache.org/thread.html/r57245853c7245baab09eae08728c52b58fd77666538092389cc3e882@%3Ccommits.servicecomb.apache.org%3E Mailing List Third Party Advisory
https://lists.apache.org/thread.html/rb523bb6c60196c5f58514b86a8585c2069a4852039b45de3818b29d2@%3Ccommits.servicecomb.apache.org%3E Mailing List Third Party Advisory
https://lists.apache.org/thread.html/r490ca5611c150d193b320a2608209180713b7c68e501b67b0cffb925@%3Ccommits.servicecomb.apache.org%3E Mailing List Third Party Advisory
https://lists.apache.org/thread.html/r6d32fc3cd547f7c9a288a57c7f525f5d00a00d5d163613e0d10a23ef@%3Ccommits.servicecomb.apache.org%3E Mailing List Third Party Advisory
https://lists.apache.org/thread.html/rcd163e421273e8dca1c71ea298dce3dd11b41d51c3a812e0394e6a5d@%3Ccommits.pulsar.apache.org%3E Mailing List Third Party Advisory
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https://lists.apache.org/thread.html/rb51d6202ff1a773f96eaa694b7da4ad3f44922c40b3d4e1a19c2f325@%3Ccommits.pulsar.apache.org%3E Mailing List Third Party Advisory
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https://lists.apache.org/thread.html/re6207ebe2ca4d44f2a6deee695ad6f27fd29d78980f1d46ed1574f91@%3Cissues.zookeeper.apache.org%3E Mailing List Third Party Advisory
https://lists.apache.org/thread.html/r2e93ce23e04c3f0a61e987d1111d0695cb668ac4ec4edbf237bd3e80@%3Ccommits.servicecomb.apache.org%3E Mailing List Third Party Advisory
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https://lists.apache.org/thread.html/r96ce18044880c33634c4b3fcecc57b8b90673c9364d63eba00385523@%3Cjira.kafka.apache.org%3E Mailing List Third Party Advisory
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https://www.debian.org/security/2021/dsa-4885 Third Party Advisory
https://lists.apache.org/thread.html/r5baac01f9e06c40ff7aab209d5751b3b58802c63734e33324b70a06a@%3Cissues.flink.apache.org%3E Mailing List Third Party Advisory
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Configurations

Configuration 1 (hide)

cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR cpe:2.3:a:netapp:oncommand_api_services:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*

Configuration 3 (hide)

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Configuration 4 (hide)

cpe:2.3:a:quarkus:quarkus:*:*:*:*:*:*:*:*

Configuration 5 (hide)

cpe:2.3:a:apache:kudu:*:*:*:*:*:*:*:*

Information

Published : 2021-03-09 19:15

Updated : 2021-10-20 16:15


NVD link : CVE-2021-21295

Mitre link : CVE-2021-21295


JSON object : View

Products Affected

netapp

  • oncommand_workflow_automation
  • oncommand_api_services

quarkus

  • quarkus

debian

  • debian_linux

netty

  • netty

apache

  • kudu
CWE
CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')